CN106872160A - One kind is without valve rod spring loaded safety valve on-line testing device - Google Patents

Abstract

The invention discloses an online calibration device for a spring type safety valve without a valve rod, which comprises an oil cylinder, a lifting rod connected with the oil cylinder and a tension sensor for monitoring the pulling force of the oil cylinder on the lifting rod. The bottom of the lifting rod is fixed with a lifting rod magnetic Base, the top is provided with the lift bar magnetic switch that controls the lift bar magnetic base. On-line verification of the non-stem spring type safety valve is performed by setting a lifting rod with a magnetic base in the device and opening the safety valve by lifting the lower spring seat. During the calibration process, before each adjustment of the adjustment ring, the calibration device can be removed only by closing the lifting lever and the magnetic switch of the oil cylinder, which reduces labor intensity and improves the efficiency of online testing.

Description

An online calibration device for a spring-type safety valve without a valve stem

technical field

The invention relates to the technical field of calibration devices for safety valves, in particular to an online calibration device for spring-type safety valves without valve stems.

Background technique

The safety valve is an important safety accessory on pressure-bearing special equipment, which plays the role of overpressure protection and guarantees the safe operation of pressure-bearing special equipment. After the safety valve is put into use, due to corrosion, material aging and other reasons, the opening pressure of the safety valve will be inconsistent with the set value. In order to ensure the reliable and accurate operation of the safety valve, the safety valve must be calibrated regularly. The regular check of the safety valve is divided into offline check and online check. Off-line calibration is to disassemble the safety valve from the equipment and use the safety valve calibration bench for calibration. Different from offline calibration, safety valve online calibration does not need to disassemble the safety valve, and the regular calibration of safety valve can be completed without stopping the equipment. At present, various equipment manufacturers have produced different types of online calibration devices for safety valves, but the principles and structures are basically the same. Most of them adopt the external force method for calibration. The valve stem of the safety valve is clamped by the clamp, and the valve stem is lifted by the oil pump. Forcibly open the safety valve and check the set pressure of the safety valve. For the stemless spring type safety valve, because there is no valve stem, the current safety valve online verification device cannot open this type of safety valve, so it is not suitable for the online verification of the stemless spring type safety valve.

Contents of the invention

The purpose of the present invention is to solve the disadvantages of the above-mentioned background technology, and provide a verification device with a simple structure that satisfies the on-line verification of a spring-type safety valve without a valve stem.

In order to achieve this goal, the on-line verification device for the non-valve spring safety valve designed by the present invention is characterized in that it includes an oil cylinder, a lifting rod connected to the oil cylinder, and a tension sensor for monitoring the pulling force of the oil cylinder on the lifting rod. The bottom of the rod is fixed with a lifting rod magnetic base, and the top is provided with a lifting rod magnetic switch for controlling the lifting rod magnetic base.

Specifically, the upper part of the lifting rod is provided with threads, and the top of the lifting rod passes through the oil cylinder and the tension sensor in sequence from bottom to top, and is threaded with a positioning nut, and the bottom surface of the positioning nut is pressed against the tension sensor.

Specifically, the tension sensor is connected with a control system.

Preferably, the bottom of the oil cylinder is provided with an oil cylinder magnetic base, and the side is provided with an oil cylinder magnetic switch for controlling the magnetism of the oil cylinder magnetic base.

The beneficial effect of the present invention is that: by setting a lifting rod with a magnetic base in the device, the method of opening the safety valve by lifting the lower spring seat is used for online verification of the non-valve stem spring type safety valve. During the calibration process, before each adjustment of the adjustment ring, the calibration device can be removed only by closing the lifting lever and the magnetic switch of the oil cylinder, which reduces labor intensity and improves the efficiency of online testing.

Description of drawings

Fig. 1 is a schematic diagram of the installation structure of the calibration device designed by the present invention and the non-valve stem spring safety valve;

Fig. 2 is the structural representation of the non-valve stem spring type safety valve in the present invention;

Fig. 3 is the structural representation of oil cylinder among the present invention;

Fig. 4 is the structural representation of lifting rod among the present invention;

Among them, 1—oil cylinder, 2—lifting rod, 3—tension sensor, 4—magnetic base of lifting rod, 5—magnetic switch of lifting rod, 6—locating nut, 7—control system, 8—magnetic base of oil cylinder, 9—magnetic cylinder Switch, 10—lift oil pipe joint, 11—reset oil pipe joint, 12—valve body, 13—valve cavity, 14—disc, 15—lower spring seat, 16—spring, 17—adjusting ring, 18—fixed nut.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1-4, the on-line verification device of the spring type safety valve without a valve stem, the upper part of the lifting rod 2 is provided with a thread, and the top of the lifting rod 2 passes through the oil cylinder 1 and the tension sensor 3 from bottom to top in sequence, and the thread is connected with a positioning nut 6. The bottom surface of the positioning nut 6 is pressed against the tension sensor 3. The tension sensor 3 is connected with a control system 7 . The bottom of the oil cylinder 1 is provided with an oil cylinder magnetic base 8, and the side is provided with an oil cylinder magnetic switch 9 for controlling the oil cylinder magnetic base 8. The bottom of lifting rod 2 is fixed with lifting rod magnetic base 4, and the top is provided with the lifting rod magnetic switch 5 oil cylinder magnetic base 8 of control lifting rod magnetic base 4 and lifting rod magnetic base 4 all can be electromagnet or electromagnetic block.

Working process of the present invention is:

Step 1: Extend the lifting rod 2 into the spring 16 of the safety valve to be verified, make the magnetic base 4 of the lifting rod contact the lower spring seat 15, and open the magnetic switch 5 of the lifting rod;

Step 2: Install the oil cylinder 1 and the tension sensor 3 on the lifting rod 2, adjust to a suitable position according to the specifications of the safety valve to be calibrated, place the magnetic base 8 of the oil cylinder horizontally on the fixing nut 18 of the safety valve to be calibrated, and install Positioning nut 6, open cylinder magnetic switch 9;

Step 3: Connect the tension sensor 3 with the control system 7;

Step 4: Set the preloading force in 7 of the control system, and the value of the preloading force is the gravity of the lifting rod 2;

Step 5: Start the control system 7 to apply a preload force to the lifting rod 2, so that the preload force of the spring 16 of the safety valve to be calibrated is restored to the state before the online calibrator is installed;

Step 6: Set parameters such as the set pressure, sealing surface area, and medium acting pressure of the safety valve to be verified in the control system 7, and calculate the required main loading force value;

Step 7: Further load the main loading force on the lifting rod 2, adjust the adjustment ring to a suitable height according to the opening state of the safety valve, and complete the online verification of the safety valve;

Step 8: Turn off the lifting rod magnetic switch 5 and the oil cylinder magnetic switch 9 and loosen the positioning nut 6 to remove the device.

The above descriptions are only preferred embodiments of the present invention, and do not limit the structure of the present invention in any form. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (4)

1. one kind is without valve rod spring loaded safety valve on-line testing device, it is characterised in that：Connected including oil cylinder (1) and oil cylinder (1) Lifting arm (2) and monitoring oil cylinder (1) to the pulling force sensor (3) of the pulling force of lifting arm (2), the bottom of the lifting arm (2) Lifting arm magnetic bases (4) are fixed with, top is provided with the lifting arm magnetic switch (5) of control lifting arm magnetic bases (4).

2. one kind as claimed in claim 1 is without valve rod spring loaded safety valve on-line testing device, it is characterised in that：The lifting Bar (2) top is provided with screw thread, and lifting arm (2) top sequentially passes through oil cylinder (1) and pulling force sensor (3), spiral shell from the bottom to top Line is connected with location nut (6), and location nut (6) bottom surface compresses with pulling force sensor (3).

3. one kind as claimed in claim 2 is without valve rod spring loaded safety valve on-line testing device, it is characterised in that：The pulling force Sensor (3) is connected with control system (7).

4. one kind as claimed in claim 2 is without valve rod spring loaded safety valve on-line testing device, it is characterised in that：The oil cylinder (1) bottom is provided with oil cylinder magnetic bases (8), and sidepiece is provided with the oil cylinder magnetic switch of the magnetic of control cylinder magnetic bases (8) (9)。